Why was the torpedo such an effective weapon for the U-boats (submarines)?

Need it now explain gorbachev’s policy of glasnost. how did this policy change the soviet union?

By the end of the 1800s, there was a change in the nature of the immigrants coming to the united states. immigration from northern europe—england, ireland, germany, and scandinavia—declined, while immigration from italy, russia, and austria-hungary grew. in fact, between 1900 and 1910, more than three-fourths of all immigrants came from these three countries. unfortunately, these countries were far removed england, the home of our founders, and the immigrants who came from them had a hard time adjusting to life in their new country.

Why was the agricultural revolution more successful in england than in the rest of europe?